Results for the UK general election on 12 December 2019 Great Britain - Elections contested by Social Democratic Party
| Constituency | Candidate | Electorate | Turnout | Votes | Vote share | Vote change | Position |
| Basildon and Billericay | BREEDON, Simon | 69,906 | 63.1% | 224 | 0.5% | - | 5th |
| Cambridge | ROBINS, Jane | 79,951 | 67.2% | 91 | 0.2% | - | 7th |
| Cynon Valley | MCLEAN, Ian | 51,134 | 59.1% | 114 | 0.4% | - | 7th |
| Edinburgh South West | BROWN, Mev | 73,501 | 70.9% | 114 | 0.2% | - | 7th |
| Epping Forest | NEWHAM, Jon | 74,304 | 67.7% | 170 | 0.3% | - | 6th |
| Folkestone and Hythe | MENNISS, Colin | 88,272 | 66.8% | 190 | 0.3% | - | 6th |
| Havant | BLACK, Alan | 72,103 | 63.7% | 344 | 0.7% | - | 5th |
| Jarrow | CONWAY, Mark | 65,103 | 62.6% | 212 | 0.5% | - | 8th |
| Keighley | ROSE, Matthew | 72,778 | 72.3% | 132 | 0.3% | - | 6th |
| Leeds Central | CLOUSTON, William | 90,971 | 54.2% | 281 | 0.6% | - | 6th |
| Leeds West | WHETSTONE, Daniel | 67,727 | 59.5% | 46 | 0.1% | - | 7th |
| Neath | WILLIAMS, Carl | 56,419 | 65.1% | 67 | 0.2% | - | 8th |
| Thirsk and Malton | TAYLOR, Michael | 80,991 | 69.9% | 127 | 0.2% | - | 8th |
| Tooting | HUBLEY, Roz | 76,954 | 76.0% | 77 | 0.1% | - | 6th |
| Tottenham | BENCE, Andrew | 75,740 | 61.9% | 91 | 0.2% | - | 6th |
| Warrington South | HICKSON, Kevin | 86,015 | 72.0% | 168 | 0.3% | - | 5th |
| Warwick and Leamington | BENNETT, Xander | 76,362 | 71.0% | 67 | 0.1% | - | 7th |
| Watford | MCGETRICK, Michael | 83,359 | 69.7% | 333 | 0.6% | - | 4th |
| Wentworth and Dearne | BETTNEY, David | 74,536 | 55.8% | 313 | 0.8% | - | 6th |
| York Central | DUNN, Andrew | 74,899 | 66.1% | 134 | 0.3% | - | 7th |
Turnout as calculated by the House of Commons Library, is the total number of votes cast and not spoiled, divided by the size of the electorate.
Under section 13(b) of the Representation of the People Act 1985, a candidate gaining 5% or less of the vote share will forfeit their deposit.